The new terminology for friends.
"Best friends for Life"
Either used to mock shortened computer lingo as in "omfg we are sooo bffls!" or mistakingly said when referring to a friend, can slip out in coversation by accident like LOLs sometimes do.
Jesse: Why are you hanging out with Karen? I thought you hated that bitch?
Mary: Oh god no we bonded in the ladies room the other day and are totally bffls!
"Omg Stacey and Lindsey are like joined at the hip .. they are like over the top bffls!"
Commonly used between two 'Bffs' (best friends forever) to describe the state of being Bff's.
Just like friends have their friendship. Bff's have their Bffness.
Mary: Bee! i think our Bffness is deteriorating drastically!
Jen: What do you mean Eff? Since when?
Mary: Since you've been hanging out with Sally!
Jen: I think your just being paranoid... your my Bff and our Bffness will last forever!